<template>
    <div id="tagbox" v-if="tagboxDatas" v-show="state">
        <div v-for="data in tagboxDatas">
            <a href="#" :id="data.size">{{ data.label }}</a>
        </div>
    </div>
</template>
<script>
    let radius = 164;
    let dtr = Math.PI / 180;
    let d = 200;

    let mcList = [];
    let active = false;
    let lasta = 1;
    let lastb = 1;
    let distr = true;
    let tspeed = 5;
    let size = 250;

    let mouseX = 0;
    let mouseY = 0;

    let howElliptical = 1;

    let aA = null;
    let oDiv = null;
    let sa;
    let ca;
    let sb;
    let sc;
    let cc;
    let cb;
    let per;

    function WordCloudInit(id = 'tagbox') {
        let oTag = null;

        oDiv = document.getElementById(id);

        aA = oDiv.getElementsByTagName('a');

        for (let i = 0; i < aA.length; i++) {
            oTag = {};

            oTag.offsetWidth = aA[i].offsetWidth;
            oTag.offsetHeight = aA[i].offsetHeight;
            oTag.size = aA[i].id;

            mcList.push(oTag);
        }

        sineCosine(0, 0, 0);

        positionAll();

        oDiv.onmouseover = function () {
            active = true;
        };

        oDiv.onmouseout = function () {
            active = false;
        };

        oDiv.onmousemove = function (ev) {
            const oEvent = window.event || ev;

            mouseX = oEvent.clientX - (oDiv.offsetLeft + oDiv.offsetWidth / 2);
            mouseY = oEvent.clientY - (oDiv.offsetTop + oDiv.offsetHeight / 2);

            mouseX /= 5;
            mouseY /= 5;
        };

        setInterval(update, 30);
    }

    function update() {
        let a;
        let b;

        if (active) {
            a = (-Math.min(Math.max(-mouseY, -size), size) / radius ) * tspeed;
            b = (Math.min(Math.max(-mouseX, -size), size) / radius ) * tspeed;
        }
        else {
            a = lasta * 0.98;
            b = lastb * 0.98;
        }

        lasta = a;
        lastb = b;

        if (Math.abs(a) <= 0.01 && Math.abs(b) <= 0.01) {
            return;
        }

        const c = 0;
        sineCosine(a, b, c);
        for (let j = 0; j < mcList.length; j++) {
            const rx1 = mcList[j].cx;
            const ry1 = mcList[j].cy * ca + mcList[j].cz * (-sa);
            const rz1 = mcList[j].cy * sa + mcList[j].cz * ca;

            const rx2 = rx1 * cb + rz1 * sb;
            const ry2 = ry1;
            const rz2 = rx1 * (-sb) + rz1 * cb;

            const rx3 = rx2 * cc + ry2 * (-sc);
            const ry3 = rx2 * sc + ry2 * cc;
            const rz3 = rz2;

            mcList[j].cx = rx3;
            mcList[j].cy = ry3;
            mcList[j].cz = rz3;

            per = d / (d + rz3);

            mcList[j].x = (howElliptical * rx3 * per) - (howElliptical * 2);
            mcList[j].y = ry3 * per;
            mcList[j].scale = per;
            mcList[j].alpha = per;

            mcList[j].alpha = (mcList[j].alpha - 0.6) * (10 / 6);
        }

        doPosition();
        depthSort();
    }

    function depthSort() {
        const aTmp = [];

        for (let i = 0; i < aA.length; i++) {
            aTmp.push(aA[i]);
        }

        aTmp.sort
        (
            function (vItem1, vItem2) {
                if (vItem1.cz > vItem2.cz) {
                    return -1;
                }
                else if (vItem1.cz < vItem2.cz) {
                    return 1;
                }
                else {
                    return 0;
                }
            }
        );

        for (let i = 0; i < aTmp.length; i++) {
            aTmp[i].style.zIndex = i;
        }
    }

    function positionAll() {
        let phi = 0;
        let theta = 0;
        const max = mcList.length;

        const aTmp = [];
        const oFragment = document.createDocumentFragment();

        // //随机排序
        // for (i = 0; i < aA.length; i++) {
        //     aTmp.push(aA[i]);
        // }

        aTmp.sort
        (
            function () {
                return Math.random() < 0.5 ? 1 : -1;
            }
        );

        for (let i = 0; i < aTmp.length; i++) {
            oFragment.appendChild(aTmp[i]);
        }

        oDiv.appendChild(oFragment);

        for (let i = 1; i < max + 1; i++) {
            if (distr) {
                phi = Math.acos(-1 + (2 * i - 1) / max);
                theta = Math.sqrt(max * Math.PI) * phi;
            }
            else {
                phi = Math.random() * (Math.PI);
                theta = Math.random() * (2 * Math.PI);
            }
            //坐标变换
            mcList[i - 1].cx = radius * Math.cos(theta) * Math.sin(phi);
            mcList[i - 1].cy = radius * Math.sin(theta) * Math.sin(phi);
            mcList[i - 1].cz = radius * Math.cos(phi);

            aA[i - 1].style.left = mcList[i - 1].cx + oDiv.offsetWidth / 2 - mcList[i - 1].offsetWidth / 2 + 'px';
            aA[i - 1].style.top = mcList[i - 1].cy + oDiv.offsetHeight / 2 - mcList[i - 1].offsetHeight / 2 + 'px';
        }
    }

    function doPosition() {
        const l = oDiv.offsetWidth / 2;
        const t = oDiv.offsetHeight / 2;
        for (let i = 0; i < mcList.length; i++) {
            aA[i].style.left = mcList[i].cx + l - mcList[i].offsetWidth / 2 + 'px';
            aA[i].style.top = mcList[i].cy + t - mcList[i].offsetHeight / 2 + 'px';

            //aA[i].style.fontSize=Math.ceil(12*mcList[i].scale/2)+8+'px';
            aA[i].style.fontSize = mcList[i].size + 'px';

            aA[i].style.filter = "alpha(opacity=" + 100 * mcList[i].alpha + ")";
            aA[i].style.opacity = mcList[i].alpha;
        }
    }

    function sineCosine(a, b, c) {
        sa = Math.sin(a * dtr);
        ca = Math.cos(a * dtr);
        sb = Math.sin(b * dtr);
        cb = Math.cos(b * dtr);
        sc = Math.sin(c * dtr);
        cc = Math.cos(c * dtr);
    }

    export default {
        data(){
            return {
                tagboxDatas: [
                    {label: '美女', size: '30'},
                    {label: '写真', size: '11'},
                    {label: '贴图', size: '12'},
                    {label: '灌水', size: '13'},
                    {label: '小说', size: '10'},
                    {label: '大片', size: '10'},
                    {label: '搞笑', size: '10'},
                    {label: '壁纸', size: '14'},
                    {label: '浪漫', size: '10'},
                    {label: '爆笑', size: '10'},
                    {label: '武侠', size: '10'},
                    {label: '魔幻', size: '15'},
                    {label: '教案', size: '10'},
                    {label: '论文', size: '10'},
                    {label: '科幻', size: '10'},
                    {label: '恐怖', size: '16'},
                    {label: '游戏', size: '10'},
                    {label: '音乐', size: '10'},
                    {label: '幽默', size: '10'},
                    {label: '名校', size: '16'},
                    {label: '赚钱', size: '10'},
                    {label: '云计算机', size: '11'}
                ]
            }
        },
        computed: {
            state: function () {
                return this.$route.fullPath === '/'
            }
        },
        mounted(){
            WordCloudInit()
        }
    }
</script>
<style>

    #tagbox {
        position: relative;
        margin: 110px auto;
        width: 300px;
        height: 250px;

    }

    #tagbox a {
        position: absolute;
        padding: 3px 6px;
        /*font-family: Microsoft YaHei;*/
        color: #000;
        TOP: 0px;
        font-weight: bold;
        text-decoration: none;
        left: 0px
    }

    #tagbox a:hover {
        /*border: #eee 1px solid;*/
        /*background: #f2f3f5;*/
    }
</style>